Easily create Sparklines (&cht=ls) without having to manipulate other kinds of graphs.

Support for Radar charts (&cht=r or &cht=rs) to display data in a polar coordinate system.

A new Map chart type (&cht=t) which makes it easy to colour countries and regions according to your data.

Some other changes we've made:

Added scaling for text encoded data

Added support for negative numbers on bar charts

Added ability to draw data lines on bar charts

You can read more about all of this -- plus the fact that we've lifted the 50,000 queries per day limit -- on the Chart API site. And special thanks to our Technical Writer Lesley Burr, who put together this documentation in her 20% time.